PHP字符串四舍五入到小数点后两位的正确方法是什么?
$number = "520"; // It's a string from a database
$formatted_number = round_to_2dp($number);
echo $formatted_number;
输出应该是520.00;
round_to_2dp()函数应该如何定义?
PHP字符串四舍五入到小数点后两位的正确方法是什么?
$number = "520"; // It's a string from a database
$formatted_number = round_to_2dp($number);
echo $formatted_number;
输出应该是520.00;
round_to_2dp()函数应该如何定义?
当前回答
我自己做。
$decimals = 2;
$number = 221.12345;
$number = $number * pow(10, $decimals);
$number = intval($number);
$number = $number / pow(10, $decimals);
其他回答
另外,
$padded = sprintf('%0.2f', $unpadded); // 520 -> 520.00
http://php.net/manual/en/function.round.php
e.g.
echo round(5.045, 2); // 5.05
echo round(5.055, 2); // 5.06
$twoDecNum = sprintf('%0.2f', round($number, 2));
四舍五入可以正确地将数字四舍五入,如果四舍五入后恰好只有1位小数,则sprintf会强制将其四舍五入到小数点后2位。
我自己做。
$decimals = 2;
$number = 221.12345;
$number = $number * pow(10, $decimals);
$number = intval($number);
$number = $number / pow(10, $decimals);
用于条件舍入。在需要小数的地方显示小数,否则就是整数
123.56 => 12.56
123.00 => 123
$somenumber = 123.56;
$somenumber = round($somenumber,2);
if($somenumber == intval($somenumber))
{
$somenumber = intval($somenumber);
}
echo $somenumber; // 123.56
$somenumber = 123.00;
$somenumber = round($somenumber,2);
if($somenumber == intval($somenumber))
{
$somenumber = intval($somenumber);
}
echo $somenumber; // 123